Improved dental impression-cup and suction-mould



that@ '5 tatvtatwt l @ffia t GEORGE HILLIIURD, OF MEMPHIS,. TENNESSEE.

Letters Patent No. 89,316, dated April 27, 1869.

IMPROVED DENTAL IMPRESSION-CUP .AND SUCTION-MOULD.

Tlis Schedule referred to in these Letters Patent and making part of thesame.

To all whom it may concern:

and I do hereby declare that the following is a full and exactdescription thereof, reference being had to the accompanying drawings,and to the letters of reference marked thereon.

The nature of my invention consists in providing a plate, or cup thatnearly covers the alveola, and not the entire roof of the mouth,and asthe palate part of the cup .is open, in which the second iinger of theI0peratol" is inserted, preventing-the plaster, or wax get` ting into thethroatf the patient, as is the caseswhen the present impression-*cupsnow in use, are used, producing suiocation, nausea, -and sickness.

Often in the use of the old cup, it is next to impossible'to get acorrect impression of very high palates. With present cup, in using thismy invention, the impression of `all mouths can be taken with the.nicest precision and ease, both to the operator and patient, the secondfinger acting as a wedge, to press forward the plaster, or wax back ofthe gum, and closely around ythe alveolar process.

, The mould is used in forming the suction-cavity di rectly back ofthealveolar process, thereby giving a suction more extended and permanentthan thosefnow used in thepalate, or roof of the mouth.

To enable others skilled in the art to make and use my invention, I willproceed to describe itsconstruction and operation.

I construct my dental cup, as shown in No. II Figure, it being aperspective view.

A, the handle.

B, the front rim.

C, the hollow, or circular trough, to receive the alveolar process.

Letter D displays the back, or inner rim, leaving the palate, or centreof plate open to receive the second finger of operator, as shownbyletter E.

The suction-mould, as shown by No. III, is .in width from a quarter to asixteenth of an inch, and any desired thickness, as' shown by lett-er N,and at each end tapering, and shaped to tit the inner surface, andVdirectly back of the alveolar process, also so bent as to extendforwardY directly over the process, as shown by letters M M.

The making an impression-cup for dental use, for

taking an impression of the mouth, shaped to t merely over the alveolarprocess, as shown in Fig. No. II, also mould to form the suction-cavity,as shown in Fig. No. I, each shaped and formed as above described-andset forth, and for the purposes herein stated.

GEORGE HILL HURD.

Witnesses HENRY Henn,- J As. A. OAMERoN.

